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Annotation of researchv10no/cmd/mknod.c, revision 1.1

1.1     ! root        1: main(argc, argv)
        !             2: int argc;
        !             3: char **argv;
        !             4: {
        !             5:        int m, a, b;
        !             6: 
        !             7:        if(argc != 5) {
        !             8:                printf("arg count\n");
        !             9:                goto usage;
        !            10:        }
        !            11:        if(*argv[2] == 'b')
        !            12:                m = 060666; else
        !            13:        if(*argv[2] == 'c')
        !            14:                m = 020666; else
        !            15:                goto usage;
        !            16:        a = number(argv[3]);
        !            17:        if(a < 0)
        !            18:                goto usage;
        !            19:        b = number(argv[4]);
        !            20:        if(b < 0)
        !            21:                goto usage;
        !            22:        if(mknod(argv[1], m, (a<<8)|b) < 0)
        !            23:                perror("mknod");
        !            24:        exit(0);
        !            25: 
        !            26: usage:
        !            27:        printf("usage: mknod name b/c major minor\n");
        !            28: }
        !            29: 
        !            30: number(s)
        !            31: char *s;
        !            32: {
        !            33:        int n, c;
        !            34: 
        !            35:        n = 0;
        !            36:        while(c = *s++) {
        !            37:                if(c<'0' || c>'9')
        !            38:                        return(-1);
        !            39:                n = n*10 + c-'0';
        !            40:        }
        !            41:        return(n);
        !            42: }

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